The somewhat distracting hum of the Hitachi Magic Wand. (Luckily, its powers more than make up for its sound.)

Slow, wet farts.

Sneakers squeaking.

Head-scratching.

Nails on a chalkboard.

Snooki’s voice saying just about anything (though we love her anyway).

Teeth sucking.

A super phlegm-y cough.

They got nose-blowing and phlemgy coughs but missed the best sound of all from that category: when someone sucks the snot out of their nose and sinuses and down into their throat, then swallows it. Yum! I love that sound, especially while I'm eating.

I would add slacks, squat, vulva and sputum to #7. I can also think of much worse choices for #16, starting with "Mr. Fucking Bojangles" and anything by Christopher Cross ("Arthur's Theme" and "Think Of Laura" come immediately to mind.)